The Waveguide Assembly, cataloged under National Stock Number 5985-01-283-2479, is classified within Federal Supply Class 5985 (Antennas, Waveguides, and Related Equipment) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Microwave Engineering Corporation. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-283-2479 |
| Primary Part Number | R181-C1-C1 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Engineering Corporation |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.503 INCHES MINIMUM AND 0.509 INCHES MAXIMUM ALL FLANGES IN |
| Flange Quantity | 2 |
| Voltage Standing Wave Ratio | 1.20 |
| Style Designator | STRAIGHT TYPE |
| Flexibility | RIGID SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 1.210 INCHES MINIMUM AND 1.218 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR DOUBLE RIDGED EXTERNAL, RECTANGULAR |
| Flange Outside Height | 1.376 INCHES MINIMUM AND 1.406 INCHES MAXIMUM ALL FLANGES IN |
| Flange Connecting Hole Diameter | 0.145 INCHES MINIMUM AND 0.148 INCHES MAXIMUM ALL FLANGES SECOND CONNECTION FACILITY IN |
| Flange Inside Width | 1.087 INCHES MINIMUM AND 1.093 INCHES MAXIMUM ALL FLANGES IN |
| Thread Direction | RIGHT-HAND ALL FLANGES FIRST CONNECTION FACILITY |
| Waveguide Length | 2.750 INCHES NOMINAL IN |
| Nominal Thread Size | 0.138 INCHES ALL FLANGES FIRST CONNECTION FACILITY IN |
| Waveguide Outside Height | 0.750 INCHES MAXIMUM IN |
| Waveguide Outside Width | 1.340 INCHES MAXIMUM IN |
| Flange Depth | 0.245 INCHES NOMINAL ALL FLANGES IN |
| Flange Outside Width | 1.954 INCHES MINIMUM AND 1.984 INCHES MAXIMUM ALL FLANGES IN |
| Waveguide Inside Height | 0.626 INCHES MINIMUM AND 0.634 INCHES MAXIMUM IN |
| Thread Class | 2B ALL FLANGES FIRST CONNECTION FACILITY |
| Material | ALUMINUM ALLOY SINGLE TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 4 THREADED HOLE(S) ALL FLANGES FIRST CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 4 UNTHREADED HOLE(S) ALL FLANGES SECOND CONNECTION FACILITY |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) ALL FLANGES FIRST CONNECTION FACILITY |
| Flange Style | CONTACT, DOUBLE RIDGE TYPE ALL FLANGES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| R181-C1-C1 | Microwave Engineering Corporation (USA) |
| BFU475 | Frontgrade Technologies Inc. (USA) |
| 29475-107 | Microwave Development Company Inc Dba Microwave Development Company Inc (USA) |
| Reference | Meaning |
|---|---|
| 10109869-101 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5985-01-283-2479 is a Waveguide Assembly, manufactured by Microwave Engineering Corporation, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-283-2479 has 3 manufacturer part numbers on file: R181-C1-C1 (Microwave Engineering Corporation), BFU475 (Frontgrade Technologies Inc.), 29475-107 (Microwave Development Company Inc Dba Microwave Development Company Inc).
Key specifications for R181-C1-C1: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.503 INCHES MINIMUM AND 0.509 INCHES MAXIMUM ALL FLANGES IN; Flange Quantity: 2; Voltage Standing Wave Ratio: 1.20. 25 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 5985-01-283-2479 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.